Answer:
The correct option is: b. ego
Step-by-step explanation:
In the Structural Model of the Human Psyche, Sigmund Freud defined the three distinct interacting components of the complex human personality: id, ego, and super-ego.
According to this principle, the ego is the realistic and organized part of the human personality, which mediates between desires of the super-ego and id. The ego acts according to the reality principle.